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Technical Highlights 25th August 2011 Sebastian Peters German National Library of Science and Technology.

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Presentation on theme: "Technical Highlights 25th August 2011 Sebastian Peters German National Library of Science and Technology."— Presentation transcript:

1 Technical Highlights 25th August 2011 Sebastian Peters German National Library of Science and Technology

2 DevCoreGroup Developer Core Group was founded in September 2010 to build a central registration infrastructure for DataCite Implementation of services in cooperation with DataCites Service Group Developers from BL, CDL, CISTI, TIB All projects are open source Source Code is hosted on GitHub

3 Services Production state: Metadata Store (MDS, DOI/Metadata management) Beta state: Metadata Export (OAI) Search Future development: Content Negotiation

4 Metadata Store (MDS) MDS is DataCites central infrastructure for DOI Management: Minting/Updating of DOIs Storing of metadata Releases: December 2010 (public beta) June 1st 2011 (v2, production state) MDS is only accessible by DataCite members (and their datacentres): Overview I

5 Metadata Store (MDS) User Roles: Allocators (=DataCite Member) can create and manage accounts for associated datacentres Datacentres can mint/update DOIs and store metadata Interfaces: User interface (UI) Programmatic interface (API) Overview II

6 Metadata Store (MDS) Infrastructure

7 Metadata Store (MDS) We only accept XML Metadata must validate to one of DataCite Metadata Schemas ( Every single version is stored (a dataset can have multiple versions of metadata – the last one is the real one) XML is stored as it comes (no transformation) Metadata Handling

8 Metadata Store (MDS) Restrictions per datacentre: List of valid domain names of landing pages DOI prefix(es) Metadata must be valid Periodically checking if landing pages exists (coming soon) Quality Assurance

9 Metadata Store (MDS) Best for low volume operations Maintain DOIs and metadata with simple web forms Optimal for datacentres with only a small amount of DOIs User Interface

10 Metadata Store (MDS) Best for bulk operations Can be integrated in existing infrastructures Simple RESTful API All the traffic goes via HTTPS All requests require HTTP Basic authentication API documentation: API PUT /metadata/10.5072/TEST HTTP/1.1 Host: Authorization: Basic Rk9PLkJBUjoxMjM0NTY3OA== Content-Type: application/xml;charset=UTF-8 …

11 Metadata Store (MDS) Datacentres can access MDS directly if allowed by its allocator Favored e.g. by BL,TIB Allocator can use MDS via API and develop custom frontend for datacentres Favored e.g. by CDL Direct Access or Custom Frontend?

12 Metadata Export (OAI) Service for 3rd parties to harvest metadata stored in the DataCite Metadata Store (MDS) using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH). Metadata formats so far: Dublin Core, DataCite Metadata Schema Sets for each allocator and datacentre for easy harvesting Beta version is available at OAI-PMH

13 Metadata Export (OAI) Example

14 Metadata Search Open service to search metadata stored in the DataCite Metadata Store (MDS) Based on Lucene Solr User Interface Complex boolean query language Facets (Drilldown) API Beta version available at Overview

15 Metadata Search Home Page

16 Metadata Search Result List

17 Metadata Search Drilldown

18 Metadata Search Special form for advanced search We also support complex lucene query syntax, e.g. title:laser OR subject:laser publicationYear:[1990 TO 1995] Advanced Search

19 Content Negotiation for DOIs Service for getting metadata of a DOI Uses DOI proxy ( First implemented by CNRI and CrossRef: but the beauty of the setup is that from now on, any DOI registration agency can enable content negotiation for their constituencies as well. DataCite- we're looking at you ;-). (Geoffrey Bilder on CrossTech blog) Prototype (for some selective prefixes) is running at Inspired By CrossRef

20 Content Negotiation for DOIs HTTP Content Negotiation is a simple way for HTTP clients to get different representations of the same resource. Client only needs to know the internet media type (MIME type) We will expose metadata in DataCite Format via application/x-datacite+xml Other media types will follow (Dublin Core, RDF, BibTex, etc.) Could also be used to link directly to the dataset What is Conneg? Getting Metadata: GET /10.5072/TEST HTTP/1.1 Host: Accept: application/x-datacite+xml Resolving DOI: GET /10.5072/TEST HTTP/1.1 Host:

21 Thank you for your attention!

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